What is the ruling on money an employee takes from a client in exchange for awarding them a bid, without his manager's knowledge?

The amount offered to you by the client in exchange for the manager's approval of their offer is considered a bribe, because this action is part of your job requirements for which you are already paid a salary. Therefore, anything you take in excess of your salary falls under the category of forbidden gifts to employees. However, you are permitted to take it if the owner of the company or their representative grants you permission.